Need LSD explained

Skeeterbop · 01-21-2011, 12:52 PM

Ok, I'm hoping that people on here could explain what the differences are between a 1 way, 1.5 way, and 2 way LSD. I understand the differences between clutch and viscous types, but what are the pros and cons of each of the types i mentioned? Thanks a bunch for any help you can provide.

wishihadnav · 01-21-2011, 12:56 PM

1 way- locks on acceleration
1.5 way - locks on acceleration and partial lock on deceleration
2 way - locks on acceleration and deceleration..

somebody correct me if im wrong...

DavidTrife · 01-21-2011, 12:59 PM

^^ you are correct sir. Tech stuff below.

From Wikipedia:

"If there is no additional coupling on over run, the LSD is 1 way. This is a safer LSD: as soon as the driver lifts the throttle, the LSD unlocks and behaves somewhat like a conventional open differential. This is also the best for FWD cars, as it allows the car to turn in on throttle release, instead of plowing forward.[2]

If the LSD increases coupling in the same way regardless of whether the input torque is forward or reverse, it is a 2 way differential. Some drifters prefer this type as the LSD behaves the same regardless of their erratic throttle input, and lets them keep the wheels spinning all the way through a corner. An inexperienced driver can easily spin the car when using a 2 way LSD if they lift the throttle suddenly, expecting the car to settle like a conventional open differential.

If the LSD behaves somewhere in between these two extremes, it is a 1.5 way differential, which is a compromise between sportiness and safety."

Nadeem

wilsonp · 01-21-2011, 07:04 PM

Is the stock VLSD considered 1 way?

Skeeterbop · 01-21-2011, 07:55 PM

based on those descriptions I would assume so Wilsonp

1slow370 · 01-21-2011, 11:00 PM

the stock lsd could be a 2 way if bad things were happening. It works on the speed difference between the wheels so if one wheel is spinning a lot faster than the other it tries to lock up. helical gear diff's are also a "2way" as they send a torque ratio from one wheel to the other regardless of the situation. the 1, 1.5, 2 way terms are mainly used for the clutch type limited slips.

01-21-2011, 12:52 PM	#1 (permalink)
Skeeterbop A True Z Fanatic Join Date: Jan 2011 Location: Fort Bliss, TX Age: 40 Posts: 1,440 Drives: 2011 GM 370 base SP Rep Power: 16	Need LSD explained Ok, I'm hoping that people on here could explain what the differences are between a 1 way, 1.5 way, and 2 way LSD. I understand the differences between clutch and viscous types, but what are the pros and cons of each of the types i mentioned? Thanks a bunch for any help you can provide.

01-21-2011, 07:04 PM	#4 (permalink)
wilsonp A True Z Fanatic Join Date: Jul 2010 Location: Virginia Posts: 1,134 Drives: 2009 Touring Sp Nav Rep Power: 17	Is the stock VLSD considered 1 way? __________________ 2014 Cayman S PDK Sport Chrono White/Black Was 2009 370Z Touring Sport+Nav 7AT Metallic Black/Persimmon Was 1991 NSX Auto Black/Black

01-21-2011, 11:00 PM	#6 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	the stock lsd could be a 2 way if bad things were happening. It works on the speed difference between the wheels so if one wheel is spinning a lot faster than the other it tries to lock up. helical gear diff's are also a "2way" as they send a torque ratio from one wheel to the other regardless of the situation. the 1, 1.5, 2 way terms are mainly used for the clutch type limited slips. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

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01-21-2011, 12:56 PM	#2 (permalink)
wishihadnav A True Z Fanatic Join Date: Nov 2009 Location: 90090 Posts: 1,851 Drives: Force Fed Nismo Rep Power: 184	1 way- locks on acceleration 1.5 way - locks on acceleration and partial lock on deceleration 2 way - locks on acceleration and deceleration.. somebody correct me if im wrong...

01-21-2011, 12:59 PM	#3 (permalink)
DavidTrife Base Member Join Date: Jan 2011 Location: Toronto, Canada Posts: 10 Drives: 07' 350Z Spyder Rep Power: 14	^^ you are correct sir. Tech stuff below. From Wikipedia: "If there is no additional coupling on over run, the LSD is 1 way. This is a safer LSD: as soon as the driver lifts the throttle, the LSD unlocks and behaves somewhat like a conventional open differential. This is also the best for FWD cars, as it allows the car to turn in on throttle release, instead of plowing forward.[2] If the LSD increases coupling in the same way regardless of whether the input torque is forward or reverse, it is a 2 way differential. Some drifters prefer this type as the LSD behaves the same regardless of their erratic throttle input, and lets them keep the wheels spinning all the way through a corner. An inexperienced driver can easily spin the car when using a 2 way LSD if they lift the throttle suddenly, expecting the car to settle like a conventional open differential. If the LSD behaves somewhere in between these two extremes, it is a 1.5 way differential, which is a compromise between sportiness and safety." Nadeem

01-21-2011, 07:55 PM	#5 (permalink)
Skeeterbop A True Z Fanatic Join Date: Jan 2011 Location: Fort Bliss, TX Age: 40 Posts: 1,440 Drives: 2011 GM 370 base SP Rep Power: 16	based on those descriptions I would assume so Wilsonp